Is Leonardo DiCaprio 'burned out'?

The 'Wolf of Wall Street' star has been told to slow down by his friends as they fear his hectic work schedule is having a negative effect on his health and personal life.

A source told RadarOnline.com: ''Leo has been working like a demon over the past three years - and it's now starting to come back and haunt him.

''He's pretty burned out at the moment and suffering from insomnia from pushing himself so hard.

''Everybody is begging Leo to slow down but he's just very focused on making a lot of money right now -- to the exclusion of almost everything else.''

However, it appears the 39-year-old actor has been investing his money wisely as he recently spent $10 million on a new four-bedroom apartment in New York.

He also splashed out $8 million on an apartment adjacent to a $4 million home he already owns in the eco-friendly 2 River Terrace in Battery Park City last month.

And in February, he spent $5.2 million on a six-bedroom mansion in Palm Springs, California.

Meanwhile, Leonardo - who was nominated for an Oscar award last year - has already got another project lined up for later this year as he's reportedly signed up to star in 'The Revenant', which will start production in November.